Pump for oil wells



Nov. 30 1926.

G. B. MAEGLY PUMP FOR OIL WELLS 4Filed .my 2o. 1922 nimm.

Patented Nev. 3Q, i925..

UNITED STATES unan? PATENT OFFICE.

GEORGE IB. MAEGLY, OF HOUSTON, TEXAS.

PUMP FOR OIL WELLS.

Application filed July 20,

This invention is for an improvement in pumps for oil wells, and relates particularly to an improved plunger for such pumps.

The present invention has for its principal object to provide' a plunger having a positively operated valve for passing the oil on the downward stroke of the plunger from the pump barrel to the well tubing, and to provide an improved plunger struct-ure in which the valve operates, having the parts so arranged as to reduce to a minimum any liability of the parts working loose and falling olf into the pump barrel, and so arranged as to be easily replaced.

Another important object is to provide a sand wiper for keeping that portion of the interior surface of the pump barrel over which the plunger travels relatively free of sand.

These and other objects are attained by my invention which is illustrated in the accompanying drawings, in which:

Fig, 1 represents a vertical section through the pump barrel, showing the plunger in elevation;

liig. 2 is a vertical section on a larger scale through the pump barrel and plunger, showing the position of the parts when the plunger is in its uppermost position in the well. or is ytraveling upward to this position;

Fig. 3 is asimilar view of the plunger, showing the parts inthe position which they assume with the downward travel of the plunger.

In the drawing, A represents the well tubing connected at its lower end through coupling B with the` pump barrel C. The pump barrel is of the usual cylindrical construe tion, having an inwardly opening ball or checlr valve D of any known or preferred construction for trapping the fluid drawn into the pump barrel through opening al.

The lower end of the pump rod is designated 5. Screwed into the lower end of this rod is a plunger carrying rod 6 of less diameterl than rod -Spaced downwardly from the upper end of plunger carrying rod 6 is a. shoulder 7. At the lower end of this plunger carrying rod is an enlarged portion 8 having a threaded recess 9 therein. A threadedv extension on end nut 10 is screwed into this recess. Clamped between the end of the rod and the nut 10 is a cup leather or packing member 11 which extends upwardly around the enlarged portion 8. A

19221 Serial No. 576,172.

pin 12 may be. used to prevent end nut l() from turning relatively to the rod. This arrangement on .the lower end of rod 6 provides a valve whose action will be hereinafter more fully explained.

Surrounding the plunger carrying rod 6 a hollow cylindrical plunger shell 18 having a closed upper end 14E, through which the upper part of rod (i extends, the arrangement being such that the shell is normally suspended from shoulder 7, but is free to move upwardly, relatively vto rod 6, as hereinafter described, such relative movement heilig confined between shoulder 7 and the end ofrod 5.

In the side walls of the shell, near the top thereof, are ports 15. Near the lower end of the shell are a plurality of smaller ports 16. The shell is of such length that when the top 14 is in contact with shoulders 7, the cupleather or packing 11 on the lower end of the plunger carrying rod (3 is inside the shell and covers .the holes 16. When the shell has moved upwardly relatively to the rod 6, as before mentioned, parts 16 are above the packing 11, and the packing 11 is then at the extreme lower end of the shell..

Above ports 16 is a shoulder 17, on which rests the inturned part of an inverted cup leather or packing 18. This packing is held in place by means of washer 19, on which rests a second packing member or cup-leather 20. Packing member 2O is held in place by means of a metal sleeve member Q1 which has an outwardly iiared flange 2l having small openings 21a therein. On the inside face of this flange is a shoulder 21", on which rests a filter ring of felt or other fibrous substance 22. A co-acting sleeve Q3 res-ts on the top of member 21 and is so shaped as to hold filter ring 22 in place, this sleeve 23 having 4an extension 23 which extends down around the shell inside of the fibrous ring.V ln some instances, it may be desiral'ile to omit the filter ring and leave the annular space empty.

.This sleeve is perforated, as indicated at 23h, and these perforations open into an annular channel 23C on the inside face of the extension 23a. This channel registers with perforations 13a in the plunger body or shell. This annular channel serves to establish communication between the ports 231 and the perforations 13a, so that the ports need not be set in register, and also provides a sand trap in which sediment may be collectedas some of the'oilbeing pumped flows through these small p'assageways.

Resting on this member 23 is a packing member or wiper 24 which'is heldin position by sleeve 25. A nut 25 threaded onto the shell just below ports 15 holidtall the removable parts on the shell between it and shoulder 17 in compression topreventrelative movement thereof and insure efficient action. y l ,Onthe beginning of the upstrolre of the rod 5 andfplunger carrying rod 6, the plunger temporarily lremains stationaryuntil the shoulder, i', contacting with end 14k of the plunger, begins to lift it. T his slight movement of the. rod rela-tively to the plunger moves'the valve onthe .lower end of rod 6 into position to closeports 16. The contin .ued'npward movement oi rod 'thus moves theplungerup, drawing oil into the. lower part of the pump barrel. Y A A o During this upward movement, the lplun- `ger is operating against the Vweight of the column of oil in the tubing'above it. .y At all tinieafthe pressure or" this column of oil is cnnmnnicated to the interior of thef plunger throngh Uports 15. Some oit the oil linside the plunger is thereby forced out through openings 3a into groove 23C, through the hlter, and out onto the inside vof the pump barrel,l whereby the Ibarrel is lubricated with strained oil.` VPressure between the upper and lower sides oi' upper packing Q4 is equalized throngh this lubricating; passage,v

so that the paeking'd will always be held against the walls of the cylinder when the V plunger is moving in either direction, to 'wipe away any sand and dirt. and sand and dirt will have no opportunity to work in between tl e upperpaclring or wiper and the walls of the pump cylinder. The oil thus supplied as a lubricant willlalso increase the eiiiectiveness oi the two lower paclingrs on the plunger. y

@n thebeginning of the down stroke of rod 5, the rod will move. downwardly relatively to theplunger until part 14 contacts with rodvh, Then this happens, yports 16 Hwill'be open and the oil, which 1s trapped in the lowerpart of the pump cylinder, may escape through yopenings 116, the interior of the plunger-s, and the ports 15. y p

The Construction thus described provides a positively acting valve for theKV plunger, which is not liable to be rendered inoperative by the presence of dirt or grit, as may easily'happen withi'the valves usually employed in 'pumps o'this kind. By reason of the-plunger having the shoulder 17 at its lower end, 'all parts are removable from the 'upper' end oi' the shell. and consequently cannotl lose off into the pump barrel. The parts are also all so: arranged as to make them readily"replaeeable when necessary.

I claim as my invention; ,Y A p 1 A plung'erfor pumps for oil wells 'coinprising acylindrical tbody having alon'gitridinal passage through its interior,pac'lring niemhers on the outside of said bo'dy,;means 'for holding saidv packing members in' proper spaced relation, and means for filtering,` some `l`of ythe oil which is being'pnmped and conducting it tothe exterior of the plungery between somek of said packing members.

2. Jiplunger for oil pumps for oilwells comprising a cylindrical body having a longitudinal passage tl'ie'rethroi'igh, packing inenr hersen the exterior of' said'body,- alliltering means on the exterior of the Vbody between certain of said packing'inembers, means surrounding the body for holding said-filtering "means and maintaining the packing members in Vproper relation, transverse passages through the body and communicating with the `liltering means, `whereby some oi the oil being` pumped ymay escape to said filtering` means, and means for coiiducting filtered oil'tothe exterior of theplunger.

3. A plunger for'oilv pumps comprising a hollow cylindrical shell, a shoulder on the vexterior of said shell near the lower end thereof, a pair "of spaced apart packing members on the shoulder, a sleeve surronnding the shelll above.V the packing` members, said sleeve havingan outwardly flared flange Aat its top to provide a filter receivingrecess, means in said recess providin'pay "lter, a second sleeve on said shell above therst sleeve iforretaining` the iiltering means in place, a packing'memherlabove'said secondel eve, a nut for holding all' of "said members on the shell between it and theshoul der in compression` and-passages extending through said shell'an'd` communicating Vwith the hitter-ingr fineans, and means whereby iiltered oil may be conducted tothe exterior of the pinne above said lower paclingmembers low thenpper parking member.

Y ln testimony "e :eetl aiil; my s' esoneri Meneer and be- 

